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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb5ebc7d7ea756417f06eb63bb68c4b560641c393581c327a6a19386b1f547a' 
  AND token = 'pL9cgSxc23wyjYM74Ux83czreuvBU5xAFw23Owsjxvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}